This is just a wild stab in the dark but, GPS Rollover happened a little while ago... is it possible your GPS is not functioning properly...
https://www.cloudynights.com/topic/6...-bug-its-2099/
Perhaps this might provide an idea of what's going on..? Maybe...
If so, I believe Ioptron have a fix, but... it's not free...
https://www.ioptron.com/product-p/s-8411r.htm